"job done" endpoint

[paultag]

for printers / machines that require a human to get ready for the next job, there ought to be some sort of "done" endpoint to mark an in-progress job as completed, and maybe a "ready" endpoint again?

knowing 3d printer print state here isn't enough since a human may need to pull the print off the bed, or pull material off a CNC. This also gives us a chance to delete uploaded files for systems that have that side-effect.

[jessfraz]

YEAH YEAH as part of a queue (#49) which is sorely missing AND then we were talking about image reconigition for like "ready to print" like someone cleared the tray :)

[jessfraz]

since we have the camera feed